It introduces a different style of gameplay called cooperative play, in which it's possible to control 3 characters simultaneously. Unlike most similar games, Open Sonic provides a greater level of interaction between the player and the levels. It's more than just a jump'n'run; the user must come up with some strategy in order to get through the levels.
Universal Binary (PPC/Intel)
Intel or PowerPC Mac with Mac OS X 10.3.9 Panther or higher.
this game is great! Attention: There're 2 apps available. The first is for PowerPC Macs and the second for Intel Macs.